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| n | a(n) |
|---|---|
| 1 | 858 |
| 2 | 3896 |
| 3 | 16056 |
| 4 | 43848 |
| 5 | 215424 |
| 6 | 932024 |
| 7 | 2568432 |
| 8 | 12882368 |
| 9 | 56984208 |
| 10 | 157483872 |
| 11 | 797509248 |
| 12 | 3566733728 |
| 13 | 9868152000 |
| 14 | 50206873856 |
| 15 | 225779393856 |
| 16 | 624968085888 |
| 17 | 3187016753664 |
| 18 | 14371363263104 |
| 19 | 39789382386432 |
| 20 | 203137189250048 |
[858,3896,16056,43848,215424,932024,2568432, 12882368,56984208,157483872,797509248,3566733728, 9868152000,50206873856,225779393856,624968085888, 3187016753664,14371363263104,39789382386432, 203137189250048] |